The beer you take into the shower when you're in a hurry to go out and still need to get cleaned up, or want to relax from a long day.

Guy 1: Hey man, get going! We've got to leave in 20 minutes and you haven't even hit the shower yet!
Guy 2: I'm going, I'm going.. I haven't even started pre-gaming yet, what am I going to do?
Guy 1: No worries, I've got your solution. Take a shower beer.

Awesome Girlfriend: Hi honey, how was work?
Tired Boyfriend: It was stressful, my boss yelled at me and he wants me back in the office this weekend.
Awesome Girlfriend: Wow, what a day. Well don't worry, I'll start the shower and grab you a shower beer.